During cold start, fuel pressure regulator A overshoots target pressure - actual rail pressure rises above the calibrated upper limit.
Medium severity. Can I keep driving?Avoid long trips and hard acceleration. If you smell fuel or the car stalls, do not continue.
Symptoms
- Check engine light on
- Hard start, no start, or stalling under load
- Power loss especially at high load or rpm
- Possible long cranking time
Most likely causes
- Regulator stuck closed at cold start
- Fuel return path blocked by cold viscosity
What to check, in order
Start with the simplest. You can tick off each step.
Good to know
- Repair difficulty: medium
- It affects emissions.
What each character of P2C20 means
- P: Powertrain: engine and transmission
- 2: Generic code: same on every make
- C: Subsystem depends on the code range
- 20: Specific fault in that system
Frequently asked questions
Can I keep driving with code P2C20?
Avoid long trips and hard acceleration. If you smell fuel or the car stalls, do not continue.
What causes code P2C20?
The most common causes are: regulator stuck closed at cold start; fuel return path blocked by cold viscosity.
Sources
Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.